// JavaScript 要求定义的时候必须赋值
const abc: number = 123
// abc = 456

interface Person {
    "id": string,
    readonly "gender": string,
    "age": number
}

let p:Person = {
    "id":"abc",
    "gender":"M",
    "age":20
}


// p.gender = "W"
console.log(p);
